2 doctors weighed in:

Bug bites that lead in a trail up my sons back that itch?

2 doctors weighed in
Dr. Gerardo Guerra Bonilla
Family Medicine
1 doctor agrees

In brief: Bed bugs

Bedbug bites are difficult to distinguish from other arthropod bites.
A linear series of bites found on awakening suggests bedbugs, but does not occur in all cases. The "linear feeding" may occur as a single bedbug probes multiple times looking for a productive capillary or from many bedbugs feeding along a zone of exposed skin.

In brief: Bed bugs

Bedbug bites are difficult to distinguish from other arthropod bites.
A linear series of bites found on awakening suggests bedbugs, but does not occur in all cases. The "linear feeding" may occur as a single bedbug probes multiple times looking for a productive capillary or from many bedbugs feeding along a zone of exposed skin.
Dr. Gerardo Guerra Bonilla
Dr. Gerardo Guerra Bonilla
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